package com.gcloud.core.executor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import lombok.extern.slf4j.Slf4j;

@Configuration
@EnableAsync
@Slf4j
public class ExecutorConfig {
	@Bean
    public Executor asyncExecutor() {
	    log.info("start asyncExecutor");
	    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
	    //配置核心线程数
	    executor.setCorePoolSize(5);
	    //配置最大线程数
	    executor.setMaxPoolSize(5);
	    //配置队列大小
	    executor.setQueueCapacity(99999);
	    //配置线程池中的线程的名称前缀
	    executor.setThreadNamePrefix("async-service-");
	
	    // rejection-policy：当pool已经达到max size的时候，如何处理新任务
	    // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
	    executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
	    //执行初始化
	    executor.initialize();
	    return executor;
    }
}
